Yeah I had one of those. Click the button on the side of the GPU to turn the boost BIOS off (the blue LED should no longer be lit up, you will have to reboot for it to take effect). I had trouble with the boost BIOS. Then manually clock it to the BOOST values. Should be 950/1375 @ 1.175v, power slider +20%. Then click that "?" mark on GPU-Z and it will run a little test to put the GPU under stress and it will tell you if it is working at x16.